bvandeusenandClaude Opus 5.5
7cc34b5724
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Grouping read a message's images through primary_post_id alone, which only the first message imported with a file holds. The backfill runs newest-first, so the original message usually owned nothing: 101 of Yellowroom's messages (mostly 2018-2020) could never be grouped. Every image they carried also sat in another message (296 links, measured on the live instance). _message_images unions ownership with provenance for the candidate query, the drop seed, the member image links, and the merge pass. Nothing is re-owned. A later drop carrying the very file an earlier one carries now merges by a new same_image route, which nearest-neighbour could not see because it skips the image itself. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LVjrnpQjRgHdvq95rASoiR